[texhax] Error when pdflatex beamer presentations

[Martin Heller]

Steven Woody wrote:
> Hi, experts
> 
> I did some upgrade on my system, may be my cygwin, may be texlive
> iteself.  It happened several weeks ago and I am not so sure about
> what part of upgrading leads to the problem.
> 
> The beamer presentations (even those provided as samples with beamer
> package) can not be compiled any more.  I use pdflatex, if the
> presentation contains more than one frame, it will produce an error:
> 
> ! Incompatible list can't be unboxed.
> 
> But all my beamer documents worked before!   Where should I come to
> find information?

Are you using the CVS version of pgf/TikZ? If so then try to get the 
latest one. I had the same error a couple of days ago and updating pgf 
to the newest version solved the problem.